Combined timing gears and oil pump



April 21, 1959 A. DIERKSEN COMBINED TIMING GEARS AND on. PUMP 2Sheets-Sheet 1 Filed July 11, 1957 INVENTOR- 11 ,526 Emmi/V ATTORNEY 5April 21, 1959 DIERKSENY 2, COMBINED TIMING GEARS AND 011. PUMP FiledJuly 11. 1957 2 Sheets-Sheet 2 W/ Z QW ['7 yl fg $3 I if INVENTORATTORNEYS Unite S ates TheTpresentinvention 'rela'te's't'o combinedtiming gears and oir umps, "and "more particularly to such structuresused in an internal combustion engine.

The primary object of the invention is to provide a timing gearmechanism for internal combustion engines adapted to pump oil to thelubrication system of the engine.

Another object of the invention is to provide a combined timing gear andoil pump mechanism in which only a portion of the width of the gear isutilized for oil pumping purposes.

A further object of the invention is to provide a combined timing gearand oil pump mechanism in which excess oil is utilized for lubricatingthe timing gears.

A still further object of the invention is to provide a combined timinggear and oil pump mechanism which is inexpensive to manufacture,efiicient in operation, and simple to install.

Other objects and advantages will become apparent in the followingspecification when considered in the light of the attached drawings, inwhich:

Figure 1 is a front elevation of the invention with the the coverinstalled.

Figure 2 is a fragmentary vertical cross-section taken along the line 22of Figure 1, looking in the direction of the arrows.

Figure 3 is a front elevation of the invention with the cover removed.

Figure 4 is an exploded perspective view of the invention.

Figure 5 is an enlarged transverse fragmentary cross section taken alongthe line 5-5 of Figure 3, looking in the direction of the arrows.

Figure 6 is a view similar to Figure 5 of a modified form of theinvention.

Figure 7 is an enlarged fragmentary vertical crosssection taken througha modified gear structure.

Referring now to the drawings in detail wherein like referencecharacters indicate like parts throughout the several figures, thereference numeral 10 indicates generally a combined timing gear and oilpump constructed in accordance with the invention.

The combined gear timing and pump mechanism 10 is constructed for usewith an internal combustion engine 11 of conventional design having acrankshaft 12 and a camshaft 13 forming a part thereof.

The forward face 14 of the engine 11 is recessed rearwardly at 15 in anarea surrounding the crankshaft 12 and camshaft 13, as best seen inFigure 4. A port 16 opens from the recess 15 into the engine 11 and iscon nected by conduits (not shown) to the oil sump of the engine 11. Aport 17 similarly opens from the recess 15 at the opposite side thereofto the port 16 and is connected by conduits (not shown) to the pressureoil system of the engine 11.

The port 16 provides an inlet for the oil to reach the gear pump 10,while the port 17 provides an outlet carrying oil away therefrom.

A gear 18, having peripheral teeth 19 thereon, isfixed to the forwardend of the crankshaft 12 and revolves therewith. A gear 20 having teeth21 formed in the peripheral edge thereof is fixed to the camshaft 13and. revolves therewith.

The gears 18 and 20 have their teeth 19 and 21, respectively, meshing sothat movement of the gear 18 moves the gear 20. The gear 20 is somewhatlarger than the gear 18, and the camshaft 13 will revolve somewhatfaster than the crankshaft 12. The gears 18 and 20 are peripherallygrooved at 22 and 23, respectively, as can be best seen in Figure 2.

The forward face 14 of'theengine 11 is provided with a plurality ofthreaded bores 24 surrounding the recess 15, as can bebestseen in Figure4.

A pair of oppositely disposed plates 25 and 26 are shaped to overlie therecess 15 and are provided with a plurality of bores 27 around theirperipheral edges adapted to overlie the threaded bores 24 in the engine11.

The plates 25, 26 are provided with semi-circular openings 28, 29 toengage in the groove 23, and semi-circular openings 30, 31 to engage inthe groove 22, as can be best seen in Figure 4.

The plates 25, 26 are further provided with openings 32, 33 adjacent thelower edges thereof which overlie a port 34 formed in the forward face14 of the engine 11 below the recess 15.

The plates 25, 26 have abutting edges 35 and 36 on opposite sides ofeach of the openings 28, 29, 30, 31, 32, 33, extending in asubstantially straight vertical line. The abutting edges 35, 36 of theplates 25, 26 are grooved as at 37, 38 and have a sealing gasket 39extending therebetween to seal the plate 25 to the plate 26.

A domed cover 40 engages over the plates 25, 26 and has a flange 41extending inwardly therefrom to engage the plates 25, 26. The flange 41is provided with a plurality of bores 42 aligning with the bores 27 inthe plates 25, 26, and the cover 40 is secured to the engine 11 by stubbolts 43 extending through the bores 42, 27 and into the threaded bores24.

While the present invention has not been illustrated with gaskets, itshould be understood that they may be used between the plates 25, 26 andthe engine 11, as well as between the cover 40 and the plates 25, 26.

The plate 25 has a bore 44 therein closed by a spring pressed checkvalve 45 of conventional construction so as to permit the flow of oilfrom the side of the plate 25 adjacent the engine 11 to the oppositeside of the plate 25 upon a predetermined pressure being reached.

In the use and operation of the invention, oil flows into the recess 15from the port 16 and is pumped by the portion of the teeth 19 and 21lying on the side of the plates 25, 26 toward the engine 11. The oilpumped by the gears 18 and 20 is discharged through the port 17 to thepressure oil system of the engine 11.

The plates 25, 26 normally confine the oil to the area surrounding thegears 18 and 20 until the pressure of oil in the recess 15 exceeds apredetermined amount whereupon the valve 45 opens and oil passes throughthe plate 25 coming in contact with the portions of the gears 18, 20lying on the side of the plates 25, 26 opposite the engine 11. Oilpassing through the plate 25 lubricates the gears 18, 20 and flowsthrough the openings 32, 33 in the plates 25, 26 into the drain port 34in the forward face 14 of the engine 11.

'In Figure 6, a modified form of plate 25 and plate 26 is illustrated at25a and 26a. The plates 25a and 26a are of three-ply construction andhave respectively a tongue 25b and a groove 26b formed thereon tointerengage to seal the plate 25a to the plate 26a in place of thegasket 39 shown in the preferred form of the invention.

In Figure 7, a gear 20a is illustrated having a peripheral.

groove 23a formed therein for the same purpose as the groove 23. Theteeth 21a are provided with a plurality of notches 21b formed therein torelease trapped oil and to eliminate the hum and other vibratory noisesnormally associated with timing gears. I

Having thus described the preferred embodiments of the invention, itshould be understood that numerous structural modifications andadaptations in addition to those illustrated, may be employed withoutdeparting from the scope of the appended claims.

What is claimed is:

1. A combined timing gear and oil pump mechanism comprising a pair ofgears connected to an internal combustion engine, said engine having achamber enclosing said gears, said gears having the teeth thereof inmesh, said gears having aligned peripheral grooves formed in the edgesthereof extending below said teeth, means extending into each of saidperipheral grooves dividing said gears and said chamber into oil pumpingand non-oil pumping portions, and pressure responsive means asso' ciatedwith said last named means for relieving excess pressures in said oilpumping portion of said gears by directing a portion of said oil to thenon-pumping portion of said gears.

2. A device as claimed in claim 1 wherein said means dividing said gearsand said chamber comprises a pair of plates secured to the forward faceof said engine and having portions thereof engaging in said grooves.

3. A device as claimed in claim 2 wherein the means relieving pressurein the oil pumping portions of said gears comprises a relief valvecarried on one of said plates to release the excess pressures of oilfrom the pumping portions of said gears.

References Cited in the file of this patent UNITED STATES PATENTS

